I've read the other posts on this error which suggest deleting the cache. I've done that but the error persists.... I'm a bit confused as to why its throwing an error on a file that doesn't exist any more?

It may not be that the the error is because the file does not exist but because a mod left code behind somewhere that is looking for it. Look for code in your SMF files from mods that you've recently uninstalled.

Do you have phpMyAdimin or some other form of database access. Do try to disable caching directly in the database first.

If not, backup your sources folder. Then download the large upgrade package and unzip it. First try uploading some of the basic files, load.php, subs.php, boardIndex.php. If that don't help then just upload the rest of them. But do back the files in that folder first so you can revert in that's not the problem.

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